Design choices affect performance (what else is new!).

PDS (uses dynamic allocation OS SVC 99) vs RFS:

If SVC 99 is used excessively in CICS, performance degradation may/will result. RFS datasets may be placed in CICS data tables for performance considerations.


Use EXECLOAD via start-up or profile execs for pre-loading common and/or heavily used execs.

REXX/CICS interpreted execs vs compiled COBOL, assembler, etc.:

Use compiled code for performance critical applications or critical application segments.

Server execs vs nested (in-stream) execs:

Server execs can process multiple client requests and typically have a shorter path length, provide better response time, and often use less system resources.

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